GitHub has introduced a new feature that allows upstream repository contributors to make minor changes to a pull request before merging. When a user opens a pull request from a fork, they can now enable a collaboration option that permits upstream contributors to clone the fork and, with granted permission, push changes directly to the head branch of the pull request. This feature applies to pull requests created after its introduction, but contributors can manually enable or revoke this option for existing requests through a checkbox in the pull request sidebar. More detailed guidance is available in the help guide authored by Scott J. Goldman.